I agree with the concept of reducing urban sprawl but the density for this development is 30 people per acre which works out to 30 people/acre x 247 acres/(sq. km) = 7,410 people/(sq. Km). But of course this isn't a square kilometer so there won't be 7,410 people at this project.
If there were 7,410 people/(sq. km) x 5500 sq. km throughout the HRM there would be 40,755,000 people in the HRM.
PS: As a comparison - the city of Toronto
http://en.wikipedia.org/wiki/File:Toronto_map.png (not the entire metropolitan area) has 2,503,281 people on 630 square km = 3973 people/(square km) -
http://en.wikipedia.org/wiki/Toronto . This is 3973 people/(square km) x 1(sq km)/247acres = 3973/247 = 16 people per acre.
This following link has some interesting information regarding efficient suburban density -
http://www.ti.org/vaupdate17.html . I don't know how accurate it is and I don't know anything about the organization that published it.
PS: My point is - this Panorama development is a step towards reducing urban sprawl. In my opinion, encouraging urban sprawl means encouraging growth in places like Timberlea, Fall River, Waverly, Sackville ...